From what I’ve noticed with mine is the diffraction pattern is due to the ZTF (I have the Z6 and similar pattern on multiple f-mount lenses and telescopes with t-adopters to f-mount via the FTZ). But I don’t have these effects when using MFT t m-adapter to my GH4.

I need to test with a S-Line lens and see if it disappears (then it’s the on each pixel but I’m thinking no).

I’m exploring a T-Z adapter options which should eliminate the diffraction as they would replace the FTz adapter.